SPX APV Ws+, Instruction Manual

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453261 ISS U 08.2008
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1.5 Identifying the motor model
The motor is identified by removing the shroud and reading the kW
rating and the overall height of the motor on the type plate:
1.6 Special note
The Ws+ pump is designed to run at 2­pole speeds (i.e.3000/3600
rpm). Attempts to run at 4­pole speeds (1500/1800 rpm) will result in
very poor suction performance.
2.1 Reminder
The Ws+ pump, like all self­priming pumps of its type, requires an
initial charge of liquid, the priming liquid, in order to form the liquid ring
within the pump which is essential for its self­priming function. See
table.
2.2 Installation of pump
In the standard Ws+ pump the priming volume of liquid must be
retained either within the body of the pump or where it can circulate
back to the inlet. To this end the pump must be installed with outlet
vertically upwards and with a length of vertical pipe coupled to it.
A swan neck coupled directly to the pump's inlet prevents loss of that
priming volume down the inlet pipe. To provide space for discharged
air, any non­return valve must be mounted at least 0,5m downstream
of the specified length of vertical pipe. See table and figure Fig. 2.
Shorter pipe lengths will adversely affect the time taken for the
pump to self­prime.
Note that the pump should not be left running too long without
pumping (typically 15 minutes, but less if the pumped liquid is hot) as it
gets warm and loses priming liquid by evaporation.
Keep the number of valves, bends and T­pieces on the suction side to
an absolute minimum.
There must be sufficient space around the pump for piping and access
for maintenance.
1. Introduction to the Ws+ programme
2. Installation of the pump
20/15 30/30 44/50 Pumpe Ws+
1,7 2 3,7
Priming volume
litres
20/15 30/30
44/50
Pumpe Ws+
1m
(2" diam.)
1,5 m
(2" diam.)
1,5 m
(3" diam.)
or
2 m
(2" diam.)
H min (figure 2)
Fig. 2